/*
 * Copyright 2011 Alex Paréj.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.mkdir.web.converter;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import org.mkdir.model.AbstractEntitiy;

/**
 *
 * @author Alex Paréj
 */
public abstract class AbstractHasIdConverter<T extends AbstractEntitiy> implements Converter {

    protected abstract T lookupObject(FacesContext context, UIComponent component, String value);

    @Override
    public T getAsObject(FacesContext fc, UIComponent uic, String value) {
        if (value == null || value.isEmpty()) {
            return null;
        }
        try {
            return lookupObject(fc, uic, value);
        } catch (Exception e) {
            throw new ConverterException("Konvertálási hiba: " + value + " nem kovertálható!");
        }
    }

    @Override
    public String getAsString(FacesContext fc, UIComponent uic, Object o) {
        if (o == null) {
            return null;
        }
        if (o instanceof AbstractEntitiy) {
            return String.valueOf(((AbstractEntitiy) o).getId());
        }
        throw new ConverterException("Konvertálási hiba, nem megfelelő típus: " + o.getClass().getSimpleName());
    }
}
